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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.configuration;
<a class="jxr_linenumber" name="19" href="#19">19</a>  
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.util.Iterator;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.Properties;
<a class="jxr_linenumber" name="26" href="#26">26</a>  
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * A Map based Configuration.</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * This implementation of the {@code Configuration} interface is</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * initialized with a {@code java.util.Map}. The methods of the</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * {@code Configuration} interface are implemented on top of the content of</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * this map. The following storage scheme is used:</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * Property keys are directly mapped to map keys, i.e. the</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * {@code getProperty()} method directly performs a {@code get()} on</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * the map. Analogously, {@code setProperty()} or</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * {@code addProperty()} operations write new data into the map. If a value</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * is added to an existing property, a {@code java.util.List} is created,</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * which stores the values of this property.</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * An important use case of this class is to treat a map as a</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * {@code Configuration} allowing access to its data through the richer</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * interface. This can be a bit problematic in some cases because the map may</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * contain values that need not adhere to the default storage scheme used by</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * typical configuration implementations, e.g. regarding lists. In such cases</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * care must be taken when manipulating the data through the</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * {@code Configuration} interface, e.g. by calling</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * {@code addProperty()}; results may be different than expected.</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> * An important point is the handling of list delimiters: If delimiter parsing</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * is enabled (which it is per default), {@code getProperty()} checks</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * whether the value of a property is a string and whether it contains the list</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * delimiter character. If this is the case, the value is split at the delimiter</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> * resulting in a list. This split operation typically also involves trimming</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> * the single values as the list delimiter character may be surrounded by</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> * whitespace. Trimming can be disabled with the</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> * {@link #setTrimmingDisabled(boolean)} method. The whole list splitting</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * behavior can be disabled using the</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> * {@link #setDelimiterParsingDisabled(boolean)} method.</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> * Notice that list splitting is only performed for single string values. If a</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> * property has multiple values, the single values are not split even if they</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> * contain the list delimiter character.</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> * As the underlying {@code Map} is directly used as store of the property</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> * values, the thread-safety of this {@code Configuration} implementation</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * depends on the map passed to the constructor.</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * Notes about type safety: For properties with multiple values this implementation</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * creates lists of type {@code Object} and stores them. If a property is assigned</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * another value, the value is added to the list. This can cause problems if the</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * map passed to the constructor already contains lists of other types. This</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * should be avoided, otherwise it cannot be guaranteed that the application</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * might throw {@code ClassCastException} exceptions later.</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * @author Emmanuel Bourg</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * @version $Id: MapConfiguration.java 1210171 2011-12-04 18:32:07Z oheger $</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> * @since 1.1</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="90" href="#90">90</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/MapConfiguration.html">MapConfiguration</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> <strong class="jxr_keyword">implements</strong> Cloneable
<a class="jxr_linenumber" name="91" href="#91">91</a>  {
<a class="jxr_linenumber" name="92" href="#92">92</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The Map decorated by this configuration. */</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>      <strong class="jxr_keyword">protected</strong> Map&lt;String, Object&gt; map;
<a class="jxr_linenumber" name="94" href="#94">94</a>  
<a class="jxr_linenumber" name="95" href="#95">95</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A flag whether trimming of property values should be disabled.*/</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> trimmingDisabled;
<a class="jxr_linenumber" name="97" href="#97">97</a>  
<a class="jxr_linenumber" name="98" href="#98">98</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>  <em class="jxr_javadoccomment">     * Create a Configuration decorator around the specified Map. The map is</em>
<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment">     * used to store the configuration properties, any change will also affect</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment">     * the Map.</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">     * @param map the map</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="105" href="#105">105</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/MapConfiguration.html">MapConfiguration</a>(Map&lt;String, Object&gt; map)
<a class="jxr_linenumber" name="106" href="#106">106</a>     {
<a class="jxr_linenumber" name="107" href="#107">107</a>         <strong class="jxr_keyword">this</strong>.map = map;
<a class="jxr_linenumber" name="108" href="#108">108</a>     }
<a class="jxr_linenumber" name="109" href="#109">109</a> 
<a class="jxr_linenumber" name="110" href="#110">110</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment">     * Creates a new instance of {@code MapConfiguration} and initializes its</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment">     * content from the specified {@code Properties} object. The resulting</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">     * configuration is not connected to the {@code Properties} object, but all</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment">     * keys which are strings are copied (keys of other types are ignored).</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment">     * @param props the {@code Properties} object defining the content of this</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">     *        configuration</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment">     * @throws NullPointerException if the {@code Properties} object is</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment">     *         &lt;b&gt;null&lt;/b&gt;</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * @since 1.8</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="122" href="#122">122</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/MapConfiguration.html">MapConfiguration</a>(Properties props)
<a class="jxr_linenumber" name="123" href="#123">123</a>     {
<a class="jxr_linenumber" name="124" href="#124">124</a>         map = convertPropertiesToMap(props);
<a class="jxr_linenumber" name="125" href="#125">125</a>     }
<a class="jxr_linenumber" name="126" href="#126">126</a> 
<a class="jxr_linenumber" name="127" href="#127">127</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment">     * Return the Map decorated by this configuration.</em>
<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment">     * @return the map this configuration is based onto</em>
<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="132" href="#132">132</a>     <strong class="jxr_keyword">public</strong> Map&lt;String, Object&gt; getMap()
<a class="jxr_linenumber" name="133" href="#133">133</a>     {
<a class="jxr_linenumber" name="134" href="#134">134</a>         <strong class="jxr_keyword">return</strong> map;
<a class="jxr_linenumber" name="135" href="#135">135</a>     }
<a class="jxr_linenumber" name="136" href="#136">136</a> 
<a class="jxr_linenumber" name="137" href="#137">137</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">     * Returns the flag whether trimming of property values is disabled.</em>
<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment">     * @return &lt;b&gt;true&lt;/b&gt; if trimming of property values is disabled;</em>
<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment">     *         &lt;b&gt;false&lt;/b&gt; otherwise</em>
<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment">     * @since 1.7</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="144" href="#144">144</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isTrimmingDisabled()
<a class="jxr_linenumber" name="145" href="#145">145</a>     {
<a class="jxr_linenumber" name="146" href="#146">146</a>         <strong class="jxr_keyword">return</strong> trimmingDisabled;
<a class="jxr_linenumber" name="147" href="#147">147</a>     }
<a class="jxr_linenumber" name="148" href="#148">148</a> 
<a class="jxr_linenumber" name="149" href="#149">149</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">     * Sets a flag whether trimming of property values is disabled. This flag is</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">     * only evaluated if list splitting is enabled. Refer to the header comment</em>
<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_javadoccomment">     * for more information about list splitting and trimming.</em>
<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment">     * @param trimmingDisabled a flag whether trimming of property values should</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment">     *        be disabled</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * @since 1.7</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="158" href="#158">158</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setTrimmingDisabled(<strong class="jxr_keyword">boolean</strong> trimmingDisabled)
<a class="jxr_linenumber" name="159" href="#159">159</a>     {
<a class="jxr_linenumber" name="160" href="#160">160</a>         <strong class="jxr_keyword">this</strong>.trimmingDisabled = trimmingDisabled;
<a class="jxr_linenumber" name="161" href="#161">161</a>     }
<a class="jxr_linenumber" name="162" href="#162">162</a> 
<a class="jxr_linenumber" name="163" href="#163">163</a>     <strong class="jxr_keyword">public</strong> Object getProperty(String key)
<a class="jxr_linenumber" name="164" href="#164">164</a>     {
<a class="jxr_linenumber" name="165" href="#165">165</a>         Object value = map.get(key);
<a class="jxr_linenumber" name="166" href="#166">166</a>         <strong class="jxr_keyword">if</strong> ((value instanceof String) &amp;&amp; (!isDelimiterParsingDisabled()))
<a class="jxr_linenumber" name="167" href="#167">167</a>         {
<a class="jxr_linenumber" name="168" href="#168">168</a>             List&lt;String&gt; list = PropertyConverter.split((String) value, getListDelimiter(), !isTrimmingDisabled());
<a class="jxr_linenumber" name="169" href="#169">169</a>             <strong class="jxr_keyword">return</strong> list.size() &gt; 1 ? list : list.get(0);
<a class="jxr_linenumber" name="170" href="#170">170</a>         }
<a class="jxr_linenumber" name="171" href="#171">171</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="172" href="#172">172</a>         {
<a class="jxr_linenumber" name="173" href="#173">173</a>             <strong class="jxr_keyword">return</strong> value;
<a class="jxr_linenumber" name="174" href="#174">174</a>         }
<a class="jxr_linenumber" name="175" href="#175">175</a>     }
<a class="jxr_linenumber" name="176" href="#176">176</a> 
<a class="jxr_linenumber" name="177" href="#177">177</a>     @Override
<a class="jxr_linenumber" name="178" href="#178">178</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> addPropertyDirect(String key, Object value)
<a class="jxr_linenumber" name="179" href="#179">179</a>     {
<a class="jxr_linenumber" name="180" href="#180">180</a>         Object previousValue = getProperty(key);
<a class="jxr_linenumber" name="181" href="#181">181</a> 
<a class="jxr_linenumber" name="182" href="#182">182</a>         <strong class="jxr_keyword">if</strong> (previousValue == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="183" href="#183">183</a>         {
<a class="jxr_linenumber" name="184" href="#184">184</a>             map.put(key, value);
<a class="jxr_linenumber" name="185" href="#185">185</a>         }
<a class="jxr_linenumber" name="186" href="#186">186</a>         <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (previousValue instanceof List)
<a class="jxr_linenumber" name="187" href="#187">187</a>         {
<a class="jxr_linenumber" name="188" href="#188">188</a>             <em class="jxr_comment">// the value is added to the existing list</em>
<a class="jxr_linenumber" name="189" href="#189">189</a>             <em class="jxr_comment">// Note: This is problematic. See header comment!</em>
<a class="jxr_linenumber" name="190" href="#190">190</a>             ((List&lt;Object&gt;) previousValue).add(value);
<a class="jxr_linenumber" name="191" href="#191">191</a>         }
<a class="jxr_linenumber" name="192" href="#192">192</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="193" href="#193">193</a>         {
<a class="jxr_linenumber" name="194" href="#194">194</a>             <em class="jxr_comment">// the previous value is replaced by a list containing the previous value and the new value</em>
<a class="jxr_linenumber" name="195" href="#195">195</a>             List&lt;Object&gt; list = <strong class="jxr_keyword">new</strong> ArrayList&lt;Object&gt;();
<a class="jxr_linenumber" name="196" href="#196">196</a>             list.add(previousValue);
<a class="jxr_linenumber" name="197" href="#197">197</a>             list.add(value);
<a class="jxr_linenumber" name="198" href="#198">198</a> 
<a class="jxr_linenumber" name="199" href="#199">199</a>             map.put(key, list);
<a class="jxr_linenumber" name="200" href="#200">200</a>         }
<a class="jxr_linenumber" name="201" href="#201">201</a>     }
<a class="jxr_linenumber" name="202" href="#202">202</a> 
<a class="jxr_linenumber" name="203" href="#203">203</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isEmpty()
<a class="jxr_linenumber" name="204" href="#204">204</a>     {
<a class="jxr_linenumber" name="205" href="#205">205</a>         <strong class="jxr_keyword">return</strong> map.isEmpty();
<a class="jxr_linenumber" name="206" href="#206">206</a>     }
<a class="jxr_linenumber" name="207" href="#207">207</a> 
<a class="jxr_linenumber" name="208" href="#208">208</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> containsKey(String key)
<a class="jxr_linenumber" name="209" href="#209">209</a>     {
<a class="jxr_linenumber" name="210" href="#210">210</a>         <strong class="jxr_keyword">return</strong> map.containsKey(key);
<a class="jxr_linenumber" name="211" href="#211">211</a>     }
<a class="jxr_linenumber" name="212" href="#212">212</a> 
<a class="jxr_linenumber" name="213" href="#213">213</a>     @Override
<a class="jxr_linenumber" name="214" href="#214">214</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> clearPropertyDirect(String key)
<a class="jxr_linenumber" name="215" href="#215">215</a>     {
<a class="jxr_linenumber" name="216" href="#216">216</a>         map.remove(key);
<a class="jxr_linenumber" name="217" href="#217">217</a>     }
<a class="jxr_linenumber" name="218" href="#218">218</a> 
<a class="jxr_linenumber" name="219" href="#219">219</a>     <strong class="jxr_keyword">public</strong> Iterator&lt;String&gt; getKeys()
<a class="jxr_linenumber" name="220" href="#220">220</a>     {
<a class="jxr_linenumber" name="221" href="#221">221</a>         <strong class="jxr_keyword">return</strong> map.keySet().iterator();
<a class="jxr_linenumber" name="222" href="#222">222</a>     }
<a class="jxr_linenumber" name="223" href="#223">223</a> 
<a class="jxr_linenumber" name="224" href="#224">224</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="225" href="#225">225</a> <em class="jxr_javadoccomment">     * Returns a copy of this object. The returned configuration will contain</em>
<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_javadoccomment">     * the same properties as the original. Event listeners are not cloned.</em>
<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment">     * @return the copy</em>
<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="231" href="#231">231</a>     @Override
<a class="jxr_linenumber" name="232" href="#232">232</a>     <strong class="jxr_keyword">public</strong> Object clone()
<a class="jxr_linenumber" name="233" href="#233">233</a>     {
<a class="jxr_linenumber" name="234" href="#234">234</a>         <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="235" href="#235">235</a>         {
<a class="jxr_linenumber" name="236" href="#236">236</a>             <a href="../../../../org/apache/commons/configuration/MapConfiguration.html">MapConfiguration</a> copy = (MapConfiguration) <strong class="jxr_keyword">super</strong>.clone();
<a class="jxr_linenumber" name="237" href="#237">237</a>             copy.clearConfigurationListeners();
<a class="jxr_linenumber" name="238" href="#238">238</a>             <em class="jxr_comment">// Safe because ConfigurationUtils returns a map of the same types.</em>
<a class="jxr_linenumber" name="239" href="#239">239</a>             @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a class="jxr_linenumber" name="240" href="#240">240</a>             Map&lt;String, Object&gt; clonedMap = (Map&lt;String, Object&gt;) ConfigurationUtils.clone(map);
<a class="jxr_linenumber" name="241" href="#241">241</a>             copy.map = clonedMap;
<a class="jxr_linenumber" name="242" href="#242">242</a>             <strong class="jxr_keyword">return</strong> copy;
<a class="jxr_linenumber" name="243" href="#243">243</a>         }
<a class="jxr_linenumber" name="244" href="#244">244</a>         <strong class="jxr_keyword">catch</strong> (CloneNotSupportedException cex)
<a class="jxr_linenumber" name="245" href="#245">245</a>         {
<a class="jxr_linenumber" name="246" href="#246">246</a>             <em class="jxr_comment">// cannot happen</em>
<a class="jxr_linenumber" name="247" href="#247">247</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/ConfigurationRuntimeException.html">ConfigurationRuntimeException</a>(cex);
<a class="jxr_linenumber" name="248" href="#248">248</a>         }
<a class="jxr_linenumber" name="249" href="#249">249</a>     }
<a class="jxr_linenumber" name="250" href="#250">250</a> 
<a class="jxr_linenumber" name="251" href="#251">251</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="252" href="#252">252</a> <em class="jxr_javadoccomment">     * Helper method for copying all string keys from the given</em>
<a class="jxr_linenumber" name="253" href="#253">253</a> <em class="jxr_javadoccomment">     * {@code Properties} object to a newly created map.</em>
<a class="jxr_linenumber" name="254" href="#254">254</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="255" href="#255">255</a> <em class="jxr_javadoccomment">     * @param props the {@code Properties} to be copied</em>
<a class="jxr_linenumber" name="256" href="#256">256</a> <em class="jxr_javadoccomment">     * @return a newly created map with all string keys of the properties</em>
<a class="jxr_linenumber" name="257" href="#257">257</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="258" href="#258">258</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Map&lt;String, Object&gt; convertPropertiesToMap(Properties props)
<a class="jxr_linenumber" name="259" href="#259">259</a>     {
<a class="jxr_linenumber" name="260" href="#260">260</a>         Map&lt;String, Object&gt; map = <strong class="jxr_keyword">new</strong> HashMap&lt;String, Object&gt;();
<a class="jxr_linenumber" name="261" href="#261">261</a>         <strong class="jxr_keyword">for</strong> (Map.Entry&lt;Object, Object&gt; e : props.entrySet())
<a class="jxr_linenumber" name="262" href="#262">262</a>         {
<a class="jxr_linenumber" name="263" href="#263">263</a>             <strong class="jxr_keyword">if</strong> (e.getKey() instanceof String)
<a class="jxr_linenumber" name="264" href="#264">264</a>             {
<a class="jxr_linenumber" name="265" href="#265">265</a>                 map.put((String) e.getKey(), e.getValue());
<a class="jxr_linenumber" name="266" href="#266">266</a>             }
<a class="jxr_linenumber" name="267" href="#267">267</a>         }
<a class="jxr_linenumber" name="268" href="#268">268</a>         <strong class="jxr_keyword">return</strong> map;
<a class="jxr_linenumber" name="269" href="#269">269</a>     }
<a class="jxr_linenumber" name="270" href="#270">270</a> }
</pre>
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